Optimized Synchronous Buck Converters For Portable Applications.

By Jay Soni

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Halo Microelectronics has introduced a series of dynamic voltage scaling buck converters that can be optimized to supply voltages across different subsystems.

I2C Programmable 3A Dynamic Voltage Scaling (DVS) Buck Converters.                    Credit : Halo Microelectronics

Machinery nowadays, may it be electronic or mechanical, consists of several subsystems. Consider any smart appliance or even just a TV, it may consist of multiple tech concepts, like communication tech, processing(analog and/or digital). There are quite a large number of concepts applied and each of them require a specific range of power.

Halo Microelectronics has introduced HL7593 and HL7594 devices, a series of synchronous buck converters optimized to supply different subsystems of portable applications. The output voltage ranges from 0.600V to 1.394V in 6.25mV steps or 0.27V to 0.6272V in 2.8125mV steps programmed through an I2C interface. The output voltages can be optimized to provide a dynamic voltage scaling (DVS) function with a programmable slew rate. Additionally, a wide range of output capacitors can be used to optimize Vout stability during load transients. Inductors from 0.33µH to 0.47µH may be used without affecting loop stability.

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At moderate to light loads, pulse frequency modulation (PFM) is used to maintain conversion efficiency with a typical non-switching quiescent current of 48µA. Even with such a low quiescent current, the HL759x maintains excellent load and line transient responses. At higher loads, the system automatically switches to fixed-frequency pulse width modulation (PWM) operation at 2.4MHz for minimum VOUT ripple and optimal load transient response. In shutdown mode, the supply current drops below 1µA, reducing power consumption. Additionally, the PFM Mode can be disabled if needed through the I2C registers.

Features
  • Comprehensive Protection
  • Input under-voltage lockout (UVLO)
  • Input over-voltage protection (OVP)
  • Overcurrent and short-circuit protection
  • Thermal shutdown
  • 2.4 MHz PWM with seamless PWM/PFM switching for light-load efficiency
  • Dynamic voltage scaling (DVS) with programmable voltage slew rate
  • Excellent load and line transient
  • I2C interface with SM, FM, FM+, and HS Modes
Applications include :
  • Application processors
  • Memory, hard disk drive, and SSD
  • Smartphones
  • Tablets
  • Handheld devices

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